Since the mechanism is essentially static DH key mode (with ephemeral client key), the text should not refer to it as DHE / ECDHE, as those acronyms indicate that both sides use a fresh ephemeral (EC)DH key for each connection, when the client-facing server is in fact using a fixed key (which may be rotated a lot more often than a key from a certificate).
Since the mechanism is essentially static DH key mode (with ephemeral client key), the text should not refer to it as DHE / ECDHE, as those acronyms indicate that both sides use a fresh ephemeral (EC)DH key for each connection, when the client-facing server is in fact using a fixed key (which may be rotated a lot more often than a key from a certificate).